<?php
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/**
 * Basic implementation of a gadget spec factory.
 */
class BasicGadgetSpecFactory implements GadgetSpecFactory {

  private $fetcher;
  private $cache;

  public function __construct($fetcher) {
    $this->fetcher = $fetcher;
  }

  public function getGadgetSpec(GadgetContext $context) {
    return $this->getGadgetSpecUri($context->getUrl(), $context->getIgnoreCache());
  }

  /**
   * Retrieves a gadget specification from the cache or from the Internet.
   */
  public function getGadgetSpecUri($url, $ignoreCache) {
    return $this->fetchFromWeb($url, $ignoreCache);
  }

  /**
   * Retrieves a gadget specification from the Internet, processes its views and
   * adds it to the cache.
   */
  private function fetchFromWeb($url, $ignoreCache) {
    $remoteContentRequest = new RemoteContentRequest($url);
    $remoteContentRequest->getRequest($url, $ignoreCache);
    $spec = $this->fetcher->fetchRequest($remoteContentRequest);
    $specParser = new GadgetSpecParser();
    $context = new ProxyGadgetContext($url);
    $gadgetSpec = $specParser->parse($spec->getResponseContent(), $context);
    return $gadgetSpec;
  }

}
